Apparatus for damping noise in bar-feeding devices of screw-cutting machines

Abstract

In apparatus for damping noise in bar-feeding devices of automatic screw-cutting machines a group of rollers is composed of an upper pair of laterally spaced upright rollers and a lower pair of laterally spaced upright rollers, with an endless belt extending around each pair and resilient means urging the rollers laterally away from each other to maintain the belts taut. The lower length of the upper belt and the upper length of the lower belt are engageable with the top and bottom of a rotating and axially moving bar between them.

I claim: 
     
       1. Apparatus for damping noise in bar-feeding devices of automatic screw-cutting machines, especially for bars with a polygonal profile, the apparatus comprising at least one group of rollers composed of an upper pair of laterally spaced upright rollers and a lower pair of laterally spaced upright rollers, means supporting all of the rollers with their axes parallel to one another, an endless belt extending around each pair of rollers, the lower length of the upper belt and the upper length of the lower belt being unsupported between the rollers and adapted to engage the top and bottom of a rotating and axially moving bar between them extending across the belts, whereby to support the rotating bar as it moves said lower and upper lengths of the belts in opposite directions, and resilient means urging the rollers in each pair laterally away from each other to maintain said belts taut. 
     
     
       2. Apparatus according to claim 1, in which said roller-supporting means include pivotally supported bearing members, and said resilient means are compression springs urging the bearing members for each pair of rollers away from each other. 
     
     
       3. Apparatus according to claim 1, including a frame having a lower part supporting the lower pair of rollers and an upper part supporting the upper pair of rollers, and means pivotally connecting said frame parts together in such a way that the upper part can be swung upward and laterally from a position in which its center of gravity is at one side of said connecting means to a position in which its center of gravity is at the opposite side of said connecting means, whereby to open the frame. 
     
     
       4. Apparatus according to claim 3, in which said pivotal connecting means is located outwardly beyond the lower pair of rollers.